Butane lantern



FIG. 1 is a perspective view of the design for a butane lantern.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof; and,

FIG. 4 is a top view thereof.

The elements rendered in broken line are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a butane lantern, as shown and described. 